I noticed that if you are able to pleasure Jun enough in a short amount of time her eyes get hearts and tongue will stick out, but maybe if you are able to sustain this for long enough you would be able to overload her and cause a malfunction for a short time, and maybe have a scene around the first time this happens causing Anon to be worried about Jun.
Another idea is since Jun can only taste cum, if and when a BJ option is added if she blows you enough have her become addicted to the taste, leading to Jun waking you up in middle of the night BJ scene that could lead to you letting Jun wake you up most of the time with a BJ.
I agree with a lot of the other suggestions but my favorites are from Rin, Maciotero and SunTart
Fantastic work so far and we are looking forward to v0.80 and beyond