Kissing her in her sleep the first time is technically assault, right?
Technically, yes, but allow me to offer two points:
1) The fact that Xiao Lu wasn’t upset about the event (other than the fact that she missed it) and even tried to invoke it a second time, while not justifying it, does indicate that it’s not something we, as readers, need be concerned about in this instance; and, more importantly
2) The laws of Man and the laws of Manhua should be let to mind their own affairs.
Or, in other words, just enjoy the Yuri.