If I'm not mistaken there's some drama about that in the latest raws, so do beware. I'm personally waiting for things to be cleared up before I decide to read this or not.
Please tell me you are trolling.
Edit: Found the raws. She tells Rikka that she doesnt have a boyfriend "
right now" but that could also be interpreted as
trying to make Rikka jealous/make her aware that she could be snatched away anytime, because Suzuran realized that Rikka is unusally interested in her having a boyfriend or not. Might just be impish teasing from Suzurans side.
This is what i interpret it as, and i am hypersensitive to crap like this, to the point of me instantly dropping any yuri that pulls this het stuff. But of course, she could imply that she had boyfriends in the past. But i kind of doubt it. Sucks, because the latest chapter is not picking up on this theme except when Rikka is thinking about the issue for one panel or so.
Edit:2 Okay, rereading it again and you are absolutely right to be cautious. You could imply it as her having boyfriends in the past, too. Maybe i read too much into it, im not sure anymore either. It could really go either way with the next chapter.