Sophia remained kneeling for a long moment, staring at his cock as it continued to harden in front of her. Her cheeks burned a deep crimson, but she didn't refuse. She had agreed to this.
Slowly, she leaned forward, her heavy breasts swinging forward and hanging even lower as she moved showing the deep cleavage.
One of her hands came up hesitantly, wrapping around the thick base of his shaft. Her fingers couldn't quite meet around his girth. She gave an experimental stroke, her touch gentle at first, almost exploratory.
Tim let out a low hum of approval, his hips shifting forward slightly. "Yes... use your mouth."
Sophia's lips parted. She leaned in closer, her warm breath brushing over the swollen head of his cock. Her tongue slipped out and gave the tip a slow, hesitant lick. A string of precum stretched between her tongue and his cock as she pulled back slightly.
She licked again, this time dragging the flat of her tongue along the underside in a long, wet stroke from base to tip. The motion made her heavy breasts jiggle and sway beneath her, the soft flesh rippling with every small movement of her body. Her sundress formed tightly around the shape of her milky orbs.
She opened her mouth wider and took the head between her lips. The sight of her gentle, motherly face stretching around his thick cock was obscene. She sucked softly at first, her tongue swirling around the sensitive ridge while her hand stroked the lower half of his shaft.
Saliva quickly built up, dripping down his length and onto her fingers. She bobbed her head slowly, taking a little more of him each time. Wet, sloppy sounds filled the room with soft sucking noises mixed with the occasional quiet gag when she tried to take him deeper.
Her massive tits hung heavily between her arms, swinging and jiggling with the rhythm of her movements. Without any bra underneath her dress they bounced freely. Every time she leaned forward to take more of his cock into her mouth, her breasts swayed forward and brushed against his thighs.
Milk continued to leak from her stiff nipples in small droplets, some of it smearing against her own skin or dripping onto the floor. The contrast between her soft, lactating body and the degrading act she was performing made my own cock begin to stir again despite everything.
Tim's hand came down to rest on top of her head, fingers threading into her hair. He didn't push yet, but the possessive grip was clear.
"Deeper," he ordered, his voice rougher now. "Take it properly, bitch."
Sophia made a small, muffled sound around his cock but obeyed. She pushed forward, her lips stretching further as she took several more inches into her warm, wet mouth. Her throat fluttered around the head as she gagged softly, tears welling at the corners of her eyes.
She pulled back just enough to breathe, thick strands of saliva connecting her glistening lips to his cock. Then she went down again, sucking harder this time, her cheeks hollowing with the effort.
Her free hand slipped between her own thick thighs almost unconsciously. I could see her fingers moving, rubbing slowly at her wet pussy as she serviced him. The sight sent another wave of conflicted heat through me. My gentle sister was touching herself was the most erotic and humiliating thing I had ever witnessed.
"It feels warm." Tim's grip in her hair tightened. He began to guide her movements, pulling her forward and pushing her back in a steady rhythm. I felt jealous watching him get the blowjob, I knew how good it must be feeling as I was getting the same just now. My cock twitched craving for the warmth.
Sophia's eyes watered, but she didn't pull away. Her tongue worked constantly by licking along the underside, swirling around the head whenever she had the chance, pressing firmly against the sensitive vein running along his shaft. Saliva ran down her chin in shiny trails, dripping onto her heavy breasts and soaking the dress.
She was getting into it now, whether she wanted to admit it or not. Her sucking grew more eager, the wet sounds louder and filthier. Her thick thighs trembled slightly as her own fingers worked between them. Every time Tim pushed her head down, her massive tits swung heavily, the soft flesh jiggling and bouncing in a way that was impossible to look away from.
I sat frozen, watching it all. My cock was fully hard again, throbbing painfully inside my pants. Guilt and arousal warred inside me so intensely I could barely breathe. This was my sister, kind, protective, and now reduced to this because of my loss. And yet the sight of her submitting, her body moving so lewdly, her lips stretched around another man's cock while she touched herself all of it was burning itself into my mind.
Tim's breathing grew heavier. His hips started to thrust forward to meet her mouth.
"Use your tongue more." he groaned. "Keep going, slave. Make me cum."
Sophia moaned softly around his cock, the vibration making Tim's shaft twitch visibly. She sucked harder, taking him as deep as she could manage. Her hand stroked the base in time with her bobbing head while her tongue continued its relentless work.
Tim's grip tightened suddenly. His hips jerked forward once, twice, and then he held her head in place as he came. Thick ropes of cum flooded her mouth. Sophia's eyes widened, but she swallowed as much as she could, some of it spilling from the corners of her lips and running down her chin. Tim kept her there until he was finished, only releasing her hair when the last spurts had subsided.
Sophia pulled back slowly, gasping for air. Thick strands of cum and saliva connected her swollen lips to his still-hard cock. She wiped her mouth with the back of her hand, her heavy breasts heaving as she tried to catch her breath. Her face was flushed, her eyes glassy, and a thin line of cum still clung to her lower lip before she licked it away.
Tim looked down at her with that same victorious smile, his cock glistening and slowly softening in front of her face.
Sophia remained kneeling, her thick thighs still pressed together, her massive tits rising and falling with every shaky breath. The reality of what she had just done seemed to settle over her in that moment. Yet she didn't stand up. She stayed exactly where she was, waiting for whatever came next.
To be continued...
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