Yeah, I think kouhai is probably the main competition for the prez (until someone new comes along) - they're the only two of the harem that have had anything close to consensual intimacy (except for the bff, but she doesn't count, she's too thirsty). I'm still shipping prez, but Rin is a strong contender...She's so not into yuri, that she's ready to go on a date with her kohai 'any time', heh...
I like their chemistry, ngl.
Thanks for translation.
Upd: Jeez, chained girl is actually into this?