...and then they shagged.
"Severus?" "Hmm?" "Do you know there's a little dragon crawling out of your robe pocket?" "Yes." "Oh. All right. Is he/she friendly?" "He. Not particularly, no." "Umm -- he a gift for me?" "No." "So why do you have a dragon?" "fag-lighter." "You don't smoke." "Living with you has made me reconsider."