Zurikishi is a gift that keeps giving.

First day meeting adopted little brother and she shows up without pants and already wanting to jump his body. Those are some good thirst impressions.

Monki said:

First day meeting adopted little brother and she shows up without pants and already wanting to jump his body. Those are some good thirst impressions.

She is being a hikkomori and hadn't meet anyone aside from her parents. It won't be surprising that her libido is off the charts.