Three Alpha's, Three Mates, Three Knots

Three Alpha's, Three Mates, Three Knots ' is a story of three male avengers, James Barnes, Steve Rogers and Sam Wilson, each male is a alpha. Tony's who's a beta hires a new assistant after Pepper - his ex girlfriend and a beta as well quiets. When (y/n) first arrives at the tower she is met face to face with the three alphas, who just turns out to be her mates. With three mates who are are alpha's come with fights and lots of knoting, can this small omega handle it or will she crush under the pressure?