Female Shepard/Garrus, five times Shepard realized she was actually on a date with Garrus or rather, mating rituals of Turians are a lot different than those for humans and Shepard is a little slow on the uptake.

Female Shepard/Garrus/Tali, late night reminiscing and electric blue drinks at a certain bar on a certain moon leads to things no one really intended

Female Shepard/Garrus, Shepard wants to improve moral and she's always been a fan of Halloween.