So, bets on whether she passes out just before they get anywhere.
The probability of an event in a yuri webcomic resulting in an actual, meaningful relationship progress is given by following mathematical expression:
P[Progress]_c,U = ( 1 + exp(4 - c / U) ) ^ -1
Where c is the index of the chapter/strip where the event takes place and U is a series-specific Uselessness Constant representing the relative denseness of the characters involved. U can be arbitrarily large and empirically hovers around 30 in this case.
Now, if only I had a table for what the Uselessness Constant of each manga, manhua, light novel and webtoon I either have read, am reading or am considering reading is.