It would be so easy to leave. To pull on his underwear and shorts and call it a night. To claim that the seal has been well and truly broken, thank you very much, and he can now move on with his life and find something—real.  But as soon as he sits up, as soon as he starts looking for his shoes, Draco finds himself peeling off his shirt instead. Finds himself padding across the carpet, naked, and slipping into the bathroom.