Story for U - 3. Pls help

The whole scenario was a real turn on, and I cou ld feel myself building to a climax.
My thrusting strokes became more violent, not in a nasty way, just faster and deeper.I felt the tip of my prick bumpi ng against her cervi x, causing little muffled cries to emanate from her mouth, stuffed full of John's dick.
"I'm going to cum, guys." I grunted. shafting her passage harder and faster.
"Me too." croaked John.
My spunk shot out like an express train from a tunnel, long spurts of hot semen unloaded deep inside Gemma's little beaver, splurge after splurge shot deep inside, emptying my sac completely.
Simultaneously, John erupted and his seed blew down his sister's throat. He thrust and heaved for what seemed ages, before collapsing in a heap beside me.
"Fuck me." he gasped through clenched teeth.
"Sorry John, I don't fuck boys, but I know what you me an. That little sister of yours is some piece of ass."

to be continued.....