Yes, Lavender thought as she eyed Zach. That was certainly the grin of someone who was getting shagged well and frequently. She was pretty sure she had a grin of her own like that, or if she didn't, Seamus would put one there soon.
"Gotta love the desk shagging," Lavender replied with a grin. "I'm personally a fan of the whole kneeling under a bloke's desk to suck them off scenario." Which reminded her to convince Seamus to sit at his desk more often, at least before they turned the study into a nursery.