Hawkeye, obviously

You take your turn first. Not even trying, you just throw the pen hard at her ass cheek.

"Ow!" She shouts in protest.

"Stop moaning!" You reply.

"Let me go!" Spider-Woman exclaims, excited as she goes to retrieve the pen. She takes aim, and throws it. It's a little low, bouncing off Kate's labia. "Oops, sorry Kate!" She laughs.

"My turn." Says Captain America. He takes his mark and lines up his shot. He fires the pen like a javelin, only to have it bounce of the rim.

"Oooh!" Kate can't help but exclaim, at the feeling.

"Ok, me next." She-Hulk says as she picks up the pen.

Kate, recognizing her voice replies, "Not too hard, ok?" She-Hulk laughs as she takes her aim. She lets loose the pen and strikes Kate in the left cheek, leaving a bright red mark. "Aaaaah!" She exclaims.

"Sorry, Kate." She-Hulk Laughs again.

"Ok, let me show you how it's done." Hawkeye says as he retrieves the pen.

"Oh God, no." Kate says to herself.

Hawkeye takes aim and fires. His shot is perfect, the pen goes halfway in to her tight anus. "Oh my God!" Kate shouts as she collapses to the floor. Hawkeye celebrates as everyone applauds him.

"Congrats!" You say, "What do you want to make her do now?"