This is cruel, hilarious and intriguing, wonder if this is the only comic or if is part of a doujin?

It's part of a doujinshi, but that's the only comic on that topic.

Their reactions made my day. *thumbs up*

What's the doujin called?

Aya is a master of stealth.

Zaku_Zelo said:
Aya is a master of stealth.

Yeah, she managed to get in front of them in the second panel.