Translation attempt:
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水着強制でおっきしちゃうふたなりちゃん
Futanari-chan got big when forced to wear a swimsuit
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お・・・
おいッ
H...
hey...!
あんまり見るなって言ってんだろ
I said don't stare!
こんな水着用意しやがって・・・
You have me in swimsuit like this...
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ああもうバカッ
後ろ何けよぉ
Oh, you idiot!
Whaaat are you doing back there!
そんなジロジロ見られたら・・・
If you STARE at me like that...
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うぅ・・・
だから水着なんてやなんだ・・・
Uugh...
This is why I don't like wearing a bathing suit...
どうしてくれんだよこれぇ・・・
絶対許さねぇからなぁッ
Whaaat am I going to do about this...
I'll never forgive yoooou!