My sister walked in on us

I went to a music festival with my sister.Everything was great, and i met this guy.He seemed to fancy him and i fancied him too. So we got into his tent and we started to kiss. Then all of sudden he started fingering me. It was awesome, I really enjoyed it... until my sister walked in on us! And she just froze. Then she was like eww what're you two doing?!

Never cringed so hard in my entire life.Ever.It ruined the whole experinece,and omg it was so embarassing i jut can't get over it. Idk what to do. I am so embarassed i just can't handle it