Natasha Romanoff hadn't said a word since Clint Barton had lowered his bow and let her live. They had sat through a briefing together, both caked in dirt, blood, and sweat. After the briefing, a woman tried to take Natasha to the showers; Natasha punched the woman. Clint was then instructed to show Natasha to the showers, but not to be "overly friendly" with her, as if she would give him the chance.
Clint was frustrated by Natasha's silence. She hadn't said a word to him, and she kept looking at him in sideways glances. He wasn't sure what he expected, but he wanted to be thanked. He risked his job, and probably his life, to save her and she hadn't even thanked him.
They arrived at the showers and Natasha began to undress.
"Whoa, aren't you gonna pull the curtain closed?" Clint asked, shocked at her openness. She ignored him. He tried to look away, but found himself unable to and he knew Natasha noticed. This was probably what she wanted; she wanted to mess with him.
She turned on the shower and stepped into the shower stall, still not closing the curtain. Clint was still staring, and when he felt a stirring in his pants he decided it was time to leave.
"Okay, well, I better get my own shower." he said. He stood still for a moment, not sure what he was waiting for, and then turned to leave. As soon as his back was to Natasha, she grabbed him by the neck and practically threw him into the shower stall with her.
Clint was surprised, but he was even more surprised when Natasha began to rip off his clothes. He helped her get them off and soon they were both naked. She pushed Clint against the wall of the shower stall, kissing him hard and reaching down to tug his cock.
"You don't waste any time, do you?" he said between moans as she stroked his cock into hardness. She bit his neck to shut him up, sucking a hickey into the delicate skin. He reached for her breasts and began massaging one, pinching her nipple lightly. She moaned at the feeling and Clint started working on the other breast. After a few more strokes of his cock, Natasha pushed Clint's hand away from her breasts, pulling him closer to her and she pushed herself down onto his cock.
Clint's eyes rolled back in his head at the sensation. He hadn't had sex in weeks, and Natasha felt amazing around him. She moaned and wrapped her legs around his waist, and he switched their positions so that she was against the wall. He thrust into her slowly, enjoying the sensations of her tight heat.
Clint leaned down to suck and bite Natasha's neck and breasts. She moaned loudly and bucked her hips hard. Clint responded by quickening his thrusts, groaning against her neck as she practically screamed in pleasure.
"Oh fuck yes!" Clint yelled in pleasure, feeling Natasha's release. Clint thrust hard and fast, finishing shortly after. Even before they caught their breath, Natasha kissing Clint softly and then pushed him away from her and out of the shower. Clint was confused as he started up his own shower, but then he realized what had just happened. She had thanked him.