you and Tsukishima have been engaged for 4 years now and he is really overprotective and jealous towards you, so he doesn't leave you alone for even a minute, not even with those of the team

you were returning home after the game with Nekoma, you and Tsukishima were following everyone alone

"love... give me some kisses..."

whispers in your ear, everyone on the bus was sleeping anyway, why not take advantage of it...