Rey sleeps with Finn, and due to not fully understanding birth control/etc, she thinks she might be pregnant.
Panicked about it, she goes to the only person aside from Finn who might be able to help. Poe is as calm and soothing as ever, sits her down in his room, talks her through the next steps and her options, and basically explains everything and does what he can to help her.
+1000 if Rey isn't pregnant in the end, but the experience brings her and Poe noticeably closer together, maybe leading to ot3.
Finn/Rey or OT3. Rey has a pregnancy scare, and tells Poe first
Panicked about it, she goes to the only person aside from Finn who might be able to help. Poe is as calm and soothing as ever, sits her down in his room, talks her through the next steps and her options, and basically explains everything and does what he can to help her.
+1000 if Rey isn't pregnant in the end, but the experience brings her and Poe noticeably closer together, maybe leading to ot3.