What I'd really like to see is for Mochi to try a long-form story that's actually planned out. I think a lot of her series are done in an ad-hoc kind of way, incorporating whatever she's thinking of at the time. I think she's got good ideas, so a piece where she gives herself the chance to think them through and characters get space on the page to grow, she could probably do something really special.
I would say Kasumi and Acchan at least approaches that ideal, more so than Met My Sister (which quite frankly went on a bit too long for how much story it had) and Yuri Natsu (which has too many characters, too little focus, and doesn't feel like any sort of cohesive narrative). If Mochi isn't continuing that series because she doesn't have any ideas currently, I can appreciate that, but at the same time, things like A Neighbor aren't helping my patience.
Although, thinking about it more, perhaps Mochi's inability to draw sex scenes is what's keeping K&A from continuing?