Sebastian was walking with Ominus, chatting to him about all the stuff you would expect; mischief, house cup and a lot of other things. The Slytherin then spotted you by the entry of the library and came up to you "Well, well, well. If it isn't the goody-two-shoes themselves!" Sebastian laughed as he came up to you; obviously teasing. Ominus simply huffed as Sebastian made that remark on you, but didn't complain or anything.