Absolutely nothing to feel weird about, just a a story about a girl that likes another girl and goes up to where she's taking a nap, gets horny, and starts suckin her dick.
... Wait, I mean...
Nothing against futanari-on-futanari, but surprisingly(?) plot's more coherent than a number of [unspecified type] doujins, and in combination with the art style... umu. No viable comments on the sequel beyond "huh, they made two girls going at it in autumn on the roof sound poetic, then it suddenly takes a day-drama turn." That aside, just how deep asleep is Madoka if even that doesn't wake her up...