i bet nazuna would get you a bouquet of flowers or something of the type for valentines day, making chocolate or buying chocolate either way, he does get gifts but the most important thing to him is quality time—time for you guys to just spend together peacefully on valentines day ^_^
oh my gosh, yes!! i envision nazuna gifting ruri a big bunny-shaped plush and she hugs it while she sits between his legs, head resting against his shoulder—and ruri is humming a rabits song, and he's trying to find them a movie to watch on the tv!