is there any possible way to have sex with Yuna with out wake her up? or that's something for a future update?
best way to do that, is get your minutes upgraded, to at least, 5, then open her legs and lick her until her pink heart fills up, after that, you can penetrate the rest of the time with your dick and the wake meter wont go up. if you want to speed up the process, make sure you click the 2nd hand bottom right to rub her head while you lick so the wake up meter fills slower and u can make her cum faster, for penetration.