Wary of unscrupulous behavior on his boyfriend and roommate's part, huh? Well, Shinji is the kind of person who's endlessly trusting with the people who can actually earn his affection, so maybe it's fine if someone thinks he might be being a little careless.
It still feels kind of strange to get this kind of questioning so quickly after meeting someone, but it pulls at least some of the spotlight off of himself, so he doesn't entirely mind answering. "Of course I was." He's not even indignant about it, but he wouldn't have agreed to do it if he wasn't! For the other question, give him a moment to recall exactly... "We had the room ready for her on her birthday, so she's been with us for close to half a year now?"
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It still feels kind of strange to get this kind of questioning so quickly after meeting someone, but it pulls at least some of the spotlight off of himself, so he doesn't entirely mind answering. "Of course I was." He's not even indignant about it, but he wouldn't have agreed to do it if he wasn't! For the other question, give him a moment to recall exactly... "We had the room ready for her on her birthday, so she's been with us for close to half a year now?"