Is it normal for my sister to do this?

I am guy 21. i asked my sister if she could make me a salad and she goes il see. i told her am going out and il be back in a while.
My mate didnt turn up so i went upstairs i assume my 22 year old sister thought i was gone, she was in the kitchen and has music on , for some strange reason i thought to scare her , our kitchen has 2 entrances, one that comes out to a room which normally has its lights turned off and the door is made of glass which is always locked. i wanted to see if she was facing towards the door which i would come from as i wanted to go behind her and scare heer as a joke. So i went to the locked glass door and peeped through so she cant see me but i can, next thing i know she sitting on a footstool facing the door that am sitting past, and she is slowly taking a cucumber up her pussy. My parents are quite strict and dont let my sister wear whatever she wants . but they have gone on holiday and i dont really mind what she wears at home, as i know she is a girl and has feelings and wants too look hot and ive also been out with her while shes wearing tight jeans and see through top etc (still modest) . Any way she was wearing her night gown which she only wears in her room in her bed, as my parents wouldt liker her wearing this around the house,, butt am more westernized and consider it as perfectly normal... btw my sister is sooo very HOT, so her night gown is fully opened and she sticks the cucumber which is baout 6 inches in her pussy and she is moaning slightly with her eyes closed.. i seriously was amazed and shocked, it was like wow magical shes was really close to me but she cudnt see me and her plum shaven pussy staring me right in the face, i could see her pussy juices glistening she then licks the cucumber puts it back in her pussy and then shudders and has an orgasm .i cudnt move my eyes were transfixed examining her beautiful body

she looks like an Innocent angel to me, but i dint want to shock her, i went and texted her on her phone saying il be home in 2 mins, open the door as i need to go to the loo(only excuse i could think off to let her know ii was coming lol)

he loo(only excuse i could think off to let her know ii was coming lol) she texted back sayin okx and i see her putting her gown back on and unlocked the front door and went back to the kitchen, i cud see my salad plate . Next thing i know she starts cutting the same cucumber that was in her pussy and putting it in to my plate without even washing it . tbh i was actually quite aroused. but i think she did it in a hurry as i would come home and moan why my salad wasn't ready . well she i come in the living room asnd sit down and ask hey tanya i m feeling reaaly hungry yu have my salad and she goes 1 min zain she brings the salad to me.

and i start eating in full knowledge that the cucumber has my sisters pussy juices allover it, she sitting there and staring at me, adn i say are yu ok? this tastes nice, lol and she goes wow first time yu said something like that to me. i go am i that bad, and i by purpose lift the cucumber up and sniff it and say but it smells a little fishyy, she instantly goes redd lol and i go whats up ? why yu red for? and she goes nothingg am not reddd , whats wrong with youu. and she goes anyway am goin bedd i go ok.. well this is what happened what do you think i should do? ignore it . i think i should? anyway thought id share this with you.