Hi,
The suspicion mechanic works like this - if you end the night while:
- Yuna is left naked
- cum stains lift on/in her
- glasses guy saw Yuna naked
Yuna becomes suspicious of you (the mc) for a couple of days (5 or 6) - this means she won't accept any items (green tea, balm, chapstick) or accessories (collar, stockings) before the night and you're locked out of a shower scene.
It's best to dress her up, clean all the mess and cover her up with a blanket when the glasses guy is coming then hiding, to avoid her being suspicious. If it happens, you'll have to wait a few days (as I said 5 or 6) or wait until loop reset.
Cheers