Lily had meant to lock the door, she really had. But when your husband returns home from practice early, still sweaty and in his Quidditch jersey, and starts kissing your collar bone - well, menial things like locking the door generally slipped your mind.
So it wasn’t entirely her fault that just as James managed to pull her shirt over her head and she was able to yank down his trousers - that the front door opened.
Both of the offenders froze as they heard voices enter the hallway but neither had the time to do anything before Harry and Sirius arrived in the door way. And there was no way they could pass it off as anything but exactly what it looked like. Besides, they were seen before they could think of an excuse.
Harry stopped chattering excitedly when he looked from his godfather to the kitchen and saw his mum on the counter with her hands in his dad’s boxers, and his dad’s hands within inches of her bra. James stood between Lily’s thighs, not able to turn around because showing his son his erection was not on his list of things to do before he died. Lily had turned red - and not the attractive flushed colour she had been before they were interrupted.
The four stared at each other until the silence was broken by Harry.
"Third time this week!" The boy yelled and then he turned on his heel and the three people left heard him stamp upstairs to his room. James was then able to step away and Lily took her hairs from him, letting him reach down to pull his trousers up.
Sirius sniggered, completely undeterred by the sight of his two best friends about to shag. Merlin knew he’d seen them in even more compromising positions through the years.
"Third time this week?" He asked, unabashedly staring at Lily as he bent down to pick up her top. James glared at him.
"Walked in to our room at eleven on Monday. He just strolled in unannounced just as I got on top." Lily sighed and Sirius winced at the extra bit of information.
"Then on Wednesday he came home early from school because of a fire alarm and saw us in the living room." James continued, looping an arm around Lily’s shoulders now they were both dressed.
"Hasn’t sat on the sofa since." Lily added.
"You guys are like rabbits." Sirius muttered. "You realize he’s never going to want to touch that counter again, right?"
"Well, what with you not eating at the table, Remus not using the bathroom and Harry not touching the cloak anymore, I think we’re just about set in that sense. We’ll have ti buy a new house soon just so you can sit somewhere." James said dryly.
"He’s only ten, you guys are scarring him for life."
"It was you who told him what sex was!" Lily exclaimed.
"Only because he asked me why you two were wrestling without clothes on. What else was I going to say?" Sirius smirked.
"Padfoot, he was six.”