Natasha wasn't used to working with partners.
The red Room emphasized on working alone.
But then SHIELD partnered her with Hawkeye.
He was the one who recruited her.
Natasha took some time to adjust.
But they both began working as a team.
Natasha found that she liked working with a partner.
Clint's snark and humour were a relief for her.
He relentlessly talked over comms.
It was surprisingly comforting.
Sometime over the years, Natasha fell in love with her partner.
She felt possessive over him.
Especially when female agents flirted with him a lot.
She was territorial over him.
She didn't like it when he was assigned to different partners.
But Clint then confessed his feelings for her.
He told her she didn't need to be jealous.
He only had eyes for her.
She happily reciprocated.