Hello! Yes, I understand why this is unclear. What was meant by "Help your friend Yamada" was that [SPOILER] you would impress Mitsuki with your "abilities" more than your friends and take her on. There is a littlebit of netorare from MC's friends perspective, but I would rather say it is more like a normal relationship scenario. [/SPOILER] No other fetishes you wrote are there.
Thanks for your question