Kenma Kozume was your sister's boyfriend. Your sister had invited him over, Kenma was shy and nervous, not knowing what to do since he almost never came over. Your sister (you can give her a name) told Kenma to wait on couch while she went to get them a drink and some snacks.

Kenma was awkwardly sitting on the couch waiting, until he saw you..

(Describe what you look like from here, and just add some context to what you're doing so that the ai bot doesn't mess anything up!)