The characters in this story are all over eighteen and the age of consent, sex if it happens is consensual. UK English is the rule: if the spellings Mum, arse or colour annoy you, don't go any further, for the rest of you enjoy.
*****
Chloe pulled Jack through the front door before flinging herself at him and kissing him hard. Her hands grabbed at his clothing pulling his shorts down and trying to wrestle his t shirt over his head.
"Chlo, Chlo," Jack said, pushing his sister away and removing his t shirt." What's going on, why the sudden rush, are you really sure about this?"
Chloe tore her sundress off and stood naked before him, moving forward she slipped her hand round his stiffening dick and began to walk backwards towards her bedroom.
"I don't know and I don't care, all I want is that lovely dick of yours in me, now", she fell on the bed dragging Jack with her and wriggled around until his dick was against her labia,
"Please Jack I'm begging you, fill me up, make me feel like a real woman." she slid forward until his dick was pushing into her opening, the juices evident on his cockhead dripping from her.
"Please, please make love to me," she urged, pulling him towards her and twisting herself to take him in. His dick slid in without obstruction and he found himself deep in his sisters vagina.
Chloe grunted with satisfaction as his dick filled her up. She moved gently feeling it moving inside her.