Tony:
You were staying at The Avengers tower while your apartment was getting fumigated so Tony said you should stay with him for a while and you hated hotels so you took him up on his offer. The first night you were there Tony came in your room like "Y/N everyone left so I thought we could watch a movie and - OH MY GOD!!" You were getting dressed and looking for your favorite pjs wearing only your underwear you hadn't heard him come in because you had your earphones were on, you turned around to see a really flushed and awed Tony trying to escape your room you screamed Tony and he just said I saw nothing repeatedly until he left.
Bruce
It was a Sunday afternoon and it was incredibly hot and you weren't expecting guests so you decided to strip down to underwear. When dear old Bruce walks in and as soon as you shriek he makes a swift U turn to the door rubbing his eyes in disbelief
Steve
Your shower hadn't been working so you decided to use Steve's. You see him fast asleep so you sneak in the bathroom trying not to wake him up. Just as you finish use the shower Steve sleepily walks in to the shower not noticing you there until you both face each other completely bare, you screamed, he screamed lets just say there was a lot of screaming and blushing.
Thor
You had been in the precinct change rooms alone removing your uniform when a certain God teleports in the room and you had almost had heart attack. Thor began apologizing while trying to get there as quickly as possible
Clint
You and Clint had been practicing archery again so after you were done you decide to go take a shower you headed to the locker room. You had forgotten to carry a towel with you to the shower so since you were alone you decide to walk out that's until u and Clint ran literally into each other, you grabbed Clint's shirt out of his hand and you ask him why he is here and he says this is the guys locker room and bathroom he says pointing at the urinals, but the sign outside said female...damn it someone switched them
Natasha
You were in the locker rooms changing out of your uniform when Natasha come in and greets you you shriek quietly and cover yourself up because you were really self conscious. Natasha giggled at your action
Loki:
It was the morning after you let the guy who used you as a human SHEILD stay with you for the night. You entered the bathroom striping of your pjs not noticing the god closing his eyes relaxing in your bath tub until he screamed "OH DEAR ODIN!" You screamed he screamed there was a lot of screaming
Bucky
You and Bucky had been walking home when it started to rain, you'll were very close to the Avengers tower so he said you can dry of in there. He handed you some of Nats clothes and left so you began to take of your clothes when Bucky opens the door again "Oh by the way there are towels in th- OH MY GOD IM SO SORRY" he sees you changing and leaves quickly.
Wanda:
You and Wanda finished training so you guy hit the shower, neither of you were really shy so you guys changed in front of each other staring at each other hoping the other wouldn't notice.
Pietro
Tony was using the your office today so you told the Avengers if they needed to talk they should come to your room. You woke up late this morning and came out the shower as usual slipped on your underwear, then plugging your earphones in and swaying your hips to the music while trying to find some clothes to wear when Pietro came in for his normal 09:30 appointment not knocking just barging in and then freezing there just watching you move your almost bare body to the music he can faintly year, you turn around and yell Pietro the whole damn tower must of heard you. He still didn't move so you threw you shoe at him and with that he was off like the wind. You guys couldn't look at each other without blushing for the whole week.