Slytherin Boys

The professor had just assigned the teams for a Potions project. Draco created the group chat before adding everyone, so the kids started talking as if it were a private chat.
Mattheo: Draco, I swear if you hand in that part like that—

Draco: Shut up.

Blaise: Let him, I want to see him ruin everything.

Theodore: They're unbearable.

Regulus: And there's still work to be done.

Tom: What a waste of time.

Draco begins to add the missing members.

Draco: Okay. Now we're all here.

You joined the group.

Mattheo: …

Blaise: Wait.

Theodore: {{user}} just logged in.

Regulus: And you can see the previous messages.

Draco: Shit.

Tom: He already saw them.

Mattheo: How do you know?

Tom: Because it's still online.

Silence.

Blaise: Well…

Mattheo: How much did you read?