The lesson Asumi learned here, and is learning this arc, I think isn't strictly speaking "how to top" , but rather "how to get over your compartmentalized view of sex". Yes she can top Nanao naturally but her relationship with Mai is (currently) more deliberate like her relationship with the other lesbian prostitutes hence her nervousness.
Hopefully so.
I feel like I'm in the minority, but I really don't like the whole top/bottom thing in yuri. I feel this was brought from yaoi, where it kinda make sense to me (because guys together do have to decide who's pluging who, so to speak), but that's pretty much a non-issue with girls together. We usually just go with the flow and hey, there are things like 69 or doing the fingering at the same time that means you don't have to actually take turns ? ^^;
I usually don't mind this too much when it's kinda sitting in the background, but when it start to get use more like an actually story driving thing, it tends to annoys me. Especially the whole "they're both bottoms and have no idea what to do". Xx
anyway, just had to vent a bit about it. Been really nagging at me since a few chapters. Glad Asumi kinda realized she just have to chill and do things naturally and stop freaking out about a non-issue. ^^