Calling upon the help of any big Nico x Maki fans - there's a doujin I just can't find, even though I'm sure I checked all appropriately tagged Maki x Nico works..
The only scene I remember is - practice is cancelled because of rain, and Maki finds Nico doing exercises - sit-ups? in the club room alone - and Nico gets Maki to hold her feet down - and Maki gets a nosebleed because she has a rather amazing view of Nico's legs lol.
I don't recall what else happens - though I don't think it was nsfw. And it's not tagged nosebleed unfortunately.