Don't know how to tell you this, but I think that means your boyfriend is actually a woman. I don't make the rules, sorry.

I joke. In all seriousness though, you can be straight and have a dynamic that's more typically seen in Yuri manga. My partner and I joke all the time that we're so straight it looped all the way back around to being gay again. We're technically "straight" too, but I'm asexual and nonbinary, while she's gay as the day is long. I can't tell you how many Yuri memes I've sent her with the caption "look, it us" because it's absolutely something one of us would have done.