I know there is a scene that allows you to change the delivery girl. But how many rounds does it take? Or has something changed in this update? Please give me a hint :c
Rose is the "other" delivery girl at the grocery store. To unlock her, you need to buy up to level 2 or 3 for sex with Momoko/Melanie and have sex for more than 5 minutes (until she says it hurts). The next time you're supposed to call Momoko/Melanie back reward, Rose replaces her.
