When someone says "I guess" to a kiss, that's not enthusiastic consent. Pause and tell them you don't want to proceed without clear agreement. Give them space to say what they actually want.
enthusiastically and freely given, which means if I say, can I kiss you? And you go, I guess. Does that sound enthusiastic? No. No. So here's what I would do if that was me. I'd look at them and go, oh no, I don't want, I don't want to kiss you if you don't want to, which would allow them to then clarify. They might be like, okay, yeah, I'm not comfortable. They might say, oh, I was just thrown off. No, I do want to kiss you, but it allows for the clarity, right? Huge, huge difference there. Big difference.