The teasing progression might include sex, but not regular..:
- sex in sleep
- sex blind folded "she thinks it's someone else"
- sex because someone else, a third party, forced to do - a pervert with a gun for example, forces Anna and Bobby to have sex and films it..
- inverse sex - where Anna discovers him drunk sleeping with a boner and just blows him first.. After discovering drunk again and again (e.g. because he is partying a lot), she progresses from just blowing him to real sex, "using" his him being unconscious. Until a point where she gives him sleeping pills and fucks him at night.
- one-time consensual sex: Lucy or Liza could loose a game with him and let him at it just one time. Progression: first just touching, then blowjobs, sex. Until a point where they begin to loose on purpose.
- Bobby blindfolded: Liza / Lucy promise Bobby to find a girl to take his virginity, but can't find one, so they lie to him and say the girl is ready, but he must be blind folded. Progression: the "girl" (who is actually Liza/Lucy) likes it wants to repeat blind folded sex, and after 3-4 times such sex he accidentally removes the eye-blinder-mask and sees how Lucy/Liza is riding his dick, which makes her embarfassed and drama etc... Until she admits or finds a stupid reason..
- competition between Liza / Lucy - one overhears a phone conversation where one of the girls tells her friend how great it felt when Bobby fucked her (and she is worried if she did please him well etc.) and then also tries to get him over.
Anyways - many options to tease and still have sex.
At some point the sex games can stop - just before a story line for regular or blackmail sex. Progression: anal, sex at work etc.
Just thinking out loud lol