As soon as the door was shut behind them, Lucy was on her knees, pulling down his running shorts. She could already see how hard he was through them, and he was quite impressively sized. It sprung out from the shorts, almost catching her in the face, then she immediately wrapped her lips around the tip and started jerking the shaft.
"Oh god, I haven't been blown in so fucking long, your mouth feels so good Lucy"
Lucy went harder in response, both with her blowing, and with her own cock. She quietly slipped her spare hand into her shorts to pleasure herself.
"You've always been so hot since you moved in, I've fantasised about fucking you so much"
The dirty talk continued to turn her on, but this one threw Lucy a bit. Wasn't she a he when she moved in? Has he always seen her as a she? Regardless, moans escaped her mouth past the cock, her own work in her shorts feeling pretty good right now too.
"That perfect little body of yours turns me on so much. Especially your thick ass and thighs, and those beautiful perky tits"
At this point Lucy was desperate for his cum, but her asshole was crying out to be filled up too. She realised she'd be happy with his cum anywhere, as long as it was inside her. Lucy stopped sucking his dick and stood up, turning her back to him. She carefully pulled down her shorts, trying not to reveal her own cock, then bent over, pulling her pants away from her asshole. She looked over her shoulder back at him.
"Fuck my thick ass Dennis, do it. Fuck my asshole"
He didn't need telling twice. Thanks to all the saliva she'd left on him, and what she presumed was the stretching she'd already done, it slid in somewhat easier than she was expecting. Within moments, Dennis was pounding away, each thrust making her moan loudly. After a few minutes Lucy was close, and she could tell Dennis was too.
Suddenly there was noise on the other side of the front door. It sounded like Dennis' wife was leaving her flat. Dennis immediately froze up, hesitant to make any noise, but Lucy made up for all the thrusting he'd stopped. She was too close to her orgasm to stop now, and came loudly, filling the front of her underwear with cum. She didn't care that his wife definitely heard her right now.
The tensing of her asshole pushed Dennis over the edge too, but he managed to keep his mouth shut as he did so, filling her butt with his cum.
They stood there recovering for a minute, and when Dennis was satisfied the coast was clear, he pulled out of her ass and slipped it back into his running shorts.
"That was fucking close. Try to be quieter next time, yea?" He said, before letting himself out.
Lucy went to the bathroom to clean herself up. There'll definitely be a next time, but she can't guarantee she'll be quiet.
Walking past the mirror gave Lucy a shock though. Sticking out above her ass, were the makings of a tail. It was fleshy and had dark hairs sprouting out the end of it.
"What...the...fuck"