Question: What to do if members of your harem start a yuri relationship with each other?
Answer: Eat pasta. [TL note: This is a wordplay joke that's untranslatable and doesn't work so well in English.]
Seiji already had a certain amount of mental preparation for this topic since he knew beforehand that she was bisexual. However, it happening for real still made him feel rather strange.
"Mika, what exactly happened?" He wanted to hear the truth from the more serious girl.
"Chiaki and I had some passionate kissing," Mika replied calmly.
"You… are you alright with that?"
"It felt surprisingly nice."
Was this like ordering a strange flavor of ramen noodles but finding out to one's surprise that it tasted pretty good? Seiji couldn't help but wonder in his mind.
"It's fine as long as you can accept it. As for Chiaki… just know how to restrain yourself."
"See, Mika? I told you that Seiji wouldn't mind." Chiaki smiled.