The twins fell asleep for an hour, when Evie woke up again. She checked the time, it was 2am.
She laid there for a few minutes, leg draped over her brother, gently sliding it up and down along his crotch.
She knew this was incredibly wrong, but she just felt so comforted by it. Being close to someone, the physical contact, someone's hands rubbing her body, it all just felt right, even if it was family.
She could feel Aaron's cock start to twitch in his sleep, so she carried on sliding her leg against it, feeling it get harder against her calf.
She removed her leg and slid her hand down his body, wrapping her fingers around it when she reached it. She stared curiously at Aaron's face, watching his sleepy reaction as she gripped it tighter, sliding her hand up and down it.
He hadn't woken up yet, but he was biting his lip slightly, little moans escaping his lips with each breath. Evie kicked the duvet off them, then moved her face down to his crotch. She licked along his shaft, eyes fixated on his face, spurred on by the little changes in his face.
She spent a few minutes gently licking along it before she took the tip into her mouth again, then slowly slid her lips down the whole length of it, swirling her tongue around it for ten seconds before coming back up for air. She kept at it, each time trying to keep sucking on it for longer than the previous. Evie kept studying Aaron's face, watching for techniques were getting the best reception.
Eventually she couldn't take it anymore, wanting to feel it inside her again. She straddled her brother, gently rubbing the outside of her wet pussy against the length of his shaft.
Finally Aaron started to wake, groggily looking at his sister grinding herself against his dick. If he had any objections this time, he wasn't vocalising them, and Evie wasn't going to stop anyway.
Evie made eye contact with Aaron, then gestured towards the clock. When he looked back at her she raised a finger to her lips.
"Shhhh" she whispered, then raised herself up, grabbed Aaron's cock and slowly slid herself down onto it. She kept the slow pace, bouncing up and down on it, trying different angles and continuously studying Aaron's face. She wanted to know what felt good and what didn't, for both of them.
She quickly found a movement that felt great for both of them, and stuck with it, going harder and faster. She shoved a hand into her mouth and bit down on it, trying to contain her pleasure.
It backfired though when she instantly pierced the skin, causing her to let out a little yelp. She looked at the damage, there were two small holes where she bit down, already bleeding.
She ran her tongue along her teeth, and realised her canines had lengthened and sharped at the tip.
She kept riding though, quiet, high pitched yelps escaping her lips because she didn't want to break her skin again. She could tell Aaron was getting close, so she tensed her muscles, tightening around his cock. It started to pulse, and within seconds he was filling her with his cum. She fell forwards, shoving her face into a pillow to conceal her own orgasm, quivering as Aaron kept thrusting himself into her.
The twins came together, trying their hardest not to make any noise through the house. Evie remained on top of him, nuzzling her face into his neck as they recovered.
After five minutes she got up and grabbed her clothes, and turned to Aaron as she left the room, putting a finger to her lips again. Evie snuck down the hallway back to her own room, and had one more smoke out of the window before getting into bed and passing out for the rest of the night.