Go watch lesbians having s**, and no not po** but the amateur homemade stuff, and you'll see a surprising number of similarities with straight s**. Except the lesbian amateur couples I've seen are much more emotionally attached, probably cause they're dating for real, and I was surprised first time I watched a real lesbian couple F because it reminded me of my first time with a girl, except it was a lot less weird than mine cause mine was well my first.
Some lesbians, unlike most straight girls, HATE penetration of any kind really. Of course, some lesbians do like penetration and others, mostly tops, don't need it to live.
Whereas, straight girls, 90% of the s** is penetration in some form. So, just go watch it yourself, again the amateur stuff not the fake stuff. Although I'ma straight guy, I do wonder if girls really are that much better at giving and recieving with other girls. Can girls get other girls off better? Maybe. girl couple ra** does happen as well. although it is less than male on female or female on male ra** according to some studies, but then again, not all of those people come forward, just like not every woman (who identifies as bisexual or lesbian) that's ever been with another woman (who is bisexual or lesbian) comes out and talks about their relationship or how many good women gave them o's.
Since girl-girl ra** does definitely happen, So, of course consent is key to any decent relationship. At least pink hair is saying yes by the end of these interactions, the professor is just using the director as leverage for her own position growth. I have a feeling this is going to be the professor working her way in between these two and trying to get control over Seung-Ha.