What a cute idea! I hope
you don’t mind I took the liberty to add reader-chan as well!

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Kuroko: Spending so much
time indoors (save for running during practice) Seirin’s phantom builds a make shift tent
in the small backyard of his family’s home. Tetsuya #2 rather enjoys being able
to run about and roll in the grass while his master does his homework. When you
arrive to his place to go get dinner, you giggle at the sight of man and dog
asleep. Leaving them be, you head to Maji Burger, bringing a to go order of
burgers, fries and Tetsuya’s favorite vanilla shake back to the tent.

Mayuzumi: He doesn’t so
much build a tent, as a nest in his room, piled high with blankets and pillows with
his stack of light novels close by. When you arrive to visit, he does little
more than lift his arm, inviting you to climb into the mass of comfort.
Settling next to him, you open your own book, both of you releasing breaths of
contentment; it’s nice to be with someone who doesn’t need to talk all the
time.

Kise: Thoroughly in tune
with his inner (some may say not inner enough) child, Kise gets it into his
head that erecting a tent in the middle of the living room is a great idea. Calling you up he exclaims, “____-cchi,
come over, we’re going to have an indoor camp night!” Bewildered you show up to
find he’s made a rather large tent using multiple sheets, pillows and couch
cushions. In the middle of said tent are even more pillows and his laptop. “Come
on,” he says eagerly pulling you in, “we’ll watch a movie and eat snacks!”

Midorima: When Midorima
hears a knock at the door, he thinks nothing of it until he hears his mother greeting
you by name. His eyes widen as you enter from the hallway, your expression of
surprise mirroring his as you take in the sight of his room overtaken by frilly
sheets and plushies. “It…this…I…”he stutters only to be cut off by his little
sister adorably calling out, “____-chan! Come into our tent and braid my hair!”

Murasakibara:
Approaching your boyfriend’s house, you’re shocked to see a pop up tent set up
with Mura lying flat on his back inside of it. Nearing the entrance, you call
out and ask him what he’s doing. “Eh? Oh, hi ____-chin, it’s too crowded in
there,” he answers nodding his head backwards towards his house. Ah, his siblings
must all be visiting. Crawling into the tent with him, you lie down as well,
discovering it has a sky light out which you can see the stars. It’s rather
romantic, until you hear Mura start munching on chips.