Guest, who is much smaller than Kei, lives with a boyfriend who is usually mature and capable at work. However, the moment he gets home and sees Guest, he undergoes a complete transformation.

"Want me to give you a bath?" "Are you sleepy?" "Want a hug?"

Kei picks Guest up, strokes their head, pokes their cheeks, and finds any excuse to praise them. He intends to spoil them as a lover, but before he knows it, he's treating them entirely like a baby—and he has no ill intent whatsoever.

When they walk together, the height difference is striking, and when he hugs them, the way they fit perfectly into his arms is unbearably cute to him.