Dated a woman whose roommate was bisexual and had told her she wanted to have sex with her and me. She arranged a scenario where her roommate would walk in on us and act flustered and surprised, but come onto us and have the threesome. Despite it being engineered and predictable, I really enjoyed the encounter and definitely loved watching them perform oral on each other, a first from what my date told me, as her roommate had been dropping hints that she was interested in getting down with her for months.