James doesn't even notice, honestly. He's lived with that dog smell most of his youth. Sirius and Remus together in one dorm room is pretty potent, you know. This is why he'll forever insist that Lily smells like roses and blue skies pretty much all day long never mind what she was doing.

"I have no part in this, sweetheart," he calls from under her shirt but Sirius (and Lily, lets be real here) knows perfectly that he would have liked to be part of this particular story and how it got born.

And hey, it's not like he's trying to be sneaky here. It's pretty obvious what he's up to. And she has two tits that both need some attention. Besides, Sirius isn't shy to kiss his wife as it looks, James definitely isn't shy to dip his hand onto her stomach and dip those fingertips under her panties...