[Crossover] On Summoning Through Bonds

In this world, most people have a power called a "Quirk."

Ancheng Yanxia's ability is quite unusual. She calls it Bond Summoning.

To put it simply, she can summon people who seem to be visitors from another world. Each time, the number summoned is always at least two. And thanks to her sharp, discerning eyes, the people summoned together are always connected by a deep bond (?).

But there's one exception: Kusuo Saiki always comes alone. Why is that?

Saiki: ...

PS:

1. The heroine lives in the world of My Hero Academia.

2. The heroine is extremely charming, but there are no so-called male side characters (meaning people who like her; there may be some, but they won't appear in the story). The male lead is firmly Saiki, no wavering. Saiki is summoned alone because in fact the ability summons both Saiki and the heroine, so there's no difference in the number.

3. This story is just for fun, so please don't take it too seriously. It's also a work of self-indulgence. Apart from the heroine, Saiki, and a few canon couples, most pairings are left unclear, so interpret them as you like. Due to the author's preferences, there are some BL elements. If that's not your thing, please steer clear.

4. If a pairing here breaks up your ship (though the pairings are left open to interpretation), you can skip this part or leave politely. Thanks.