It's fetish dude. For some people, it's kinda arousing to see someone sucking
your finger, or doing that during sex
Mouth is a part of erogenous zones. Maybe it's just a coincidence that seme fingered uke's mouth after loosing his ass. Or maybe he think it's sexy to make uke tastes his ass. I don't know really.
Well, if after that the seme insert the finger(s) into the ass then it can be count as lubricant. Maybe.
well, it might sound strange but by fingers are sensitive :D
Once you try it you'll understand. Something about it is just really sexy.
ヾ(❀╹◡╹)ﾉ~ヾ(❀╹◡╹)ﾉ~ヾ(❀╹◡╹)ﾉ~
geeluc is right, it's hot as fuck and such a turn on! fingers is the most sensitive part of the human body and the mouth is an erogenous zone (which is why kissing feels so damn good). makes all the sense! and making someone taste themselves is a fetish kinda
I actually has a finger sucking kink and let me tell you, it feels so arousing when you saw or feel people doing that
In some yaoi mangas, sometimes the seme inserts his finger inside the mouth of the uke and the uke sucks it. Like whats the point of doing that??? I really dont get it