...I think Mine is the Top (with possibility of reversal?)
... in http://www.mangago.me/read-manga/snip_snail_dog_tail/mf/d_chapter-7/pg-13/, they seem to have just done it (Mine is not wearing his glasses and they both looked ruffled) and Anjo is on his stomach while Mine was sitting, and Anjo said "Let's change places, I'll mess you up".
chap 1 page 11 http://www.mangago.me/read-manga/snip_snail_dog_tail/mf/v01/c001/pg-11
I think Mine is uke. And regarding chap 7 page 13, i think Anjo is suggesting to change place cause if they stayed there he'd end up fucking Mine many more times, hence mess him up.
Still wanna know who the top is