During the night, move to the right and next to the nightstand is the thermostat; just press it and you're done. You must keep the temperature at 18.5° to get extra points. I really like the game but I don't know much English so this is an automatic translation lol
Kaede works like this:
If you convinced her after the party to stay, she will be there that same night after the party, then she will also appear at night only when it rains - if you buy and use "rain stick" in the morning, it will rain that night, thus spawning in kaede in Yuna's room
As for interactions - there are 3 with her:
- blowjob
- prone bone (unzip sleeping bag, must be laying on her belly)
- missionary (unzip sleeping bag, must be laying on her back)
I don't remember exactly how, but you can turn her around if the sleeping bag is zipped I think
She's just a side kick for MC to have some relief