Ichika is pretty likely given that her last appearance was her deciding to go full pic related. Not sure if she'd make a move without confront Nino and Miku, though.
Nino is possible since she'd already mentioned trying to kiss Fuutarou, but she didn't want to do it disguised. She may have a reason to stay disguised, though.
Miku is unlikely since she just had her hug moment that morning.
Yotsuba is a wild card.
Itsuki is very unlikely unless the kiss is an accident and she was trying to do something else.