He should have learned his lesson with Olivia.
The children (and he could still think of them as children in this event) had no problem barging into his flat at all hours, shouting for him as they slumped on the couch, pulling open a book or setting down a weapon and expecting him to be ready to serve tea and discuss the latest crisis.
Such an expectation left no room for a relationship, much less actual sex in his flat instead of at a sleazy motel.
He pressed his lips to Oz's shoulder just as he heard the door slam.
This Angel/Buffy the Vampire Slayer story was written by Kate Bolin. If you liked it, there's plenty more at http://www.dymphna.net/fanfic/. And you can feedback her at dymphna@dymphna.net.