Noncon or dubcon especially?? Oh anon you know me so well.
In the con category I ship LeafSquirrel and Mothpool.
In the noncon, I like Mapleshade x Reedshine, Ivypool x Dovewing (who is doing the nonconning swaps from Ivy to Dove when they get older. Sometimes Dove has Tigerheart/star join in), Leafpool x Cinderpaw, Leafpool x Hollypaw (both of them).

Oh, I also like the idea of Starclan and/or Dark Forest cats using their powers in dreams for some tendril action. So Spottedleaf x Sandstorm, either noncon or con. But I think it would be funny if Fire never technically cheated on Sand with Spots, but Sandstorm got down bad for the girl she was jealous of. Who's also her aunt. She and Fire are having very different dreams at night.