Don't look now, but your description of Keisha and Alison sounds like a scrumptious "lesbian taboo" scene.
"Lesbian taboo depicts a girl or woman experiencing psychological turmoil from...tasting the "forbidden fruit" of taboo lesbian sex! Usually for the first time, or nearly so."
Your description sounds like Keisha is "conflicted," which is close enough: It's the "psychological turmoil" that adds the titillation factor to lez taboo.
Alas, my rental service does not have this yet - I may have to give them a poke.