Babysitting Took A Kinky Turn

When I was younger I would babysit for my sister and brother-in-law usually with my gf . This involved zero baby sitting and mostly heavy making out and nudity on their lounge suite .
We did this most Saturday nights for over two years which we thought was fabulous as it was a warm private place we could get it in together. Sometimes if they had an early dinner booked we would go straight from school and we would make out in our uniforms .
Eventually we would get braver and explore the home and ‘ play’ around the house.
This would involve my gf trying on a lot of my sisters clothes and shoes , and underwear! Which drove me wild and we were now fucking and did that usually with my gfs teen body wrapped in my sisters adult lingerie.
New levels of delight were found when we found sis’s vibrators and we used them in my gf too .
However the kink was we found in the back of her panty draw ( with the vibrators ) a shoe box of Polaroid photos my brother in law had obviously taken .
Some of his cock , hard and cumming , some of my sister nude , some of them fucking .
My gf and I would fuck like crazy after we had masturbated looking at these.

Best Bit was the photos increased as time went on so they were obviously still filming themselves .
The final kink came a few months later . We were around on a Saturday night as usual and quick to get up to their bedroom after they had left . In the bottom draw was a vhs video labeled “ us” . My gfs mouth went wide , we had to play it . So downstairs we went and loaded it in the machine . There they were in all their glory nude on the bed doggy style fucking the night away .
We immediately got into doggy position to copy them and fucked away until we came .
We collapsed on the floor with my sister and husband still at it on the screen.
We lay there sweaty and smiling as the video ended.
A few minutes late the video did it’s screen distorted start up and started to play again . We looked at the screen and saw my brother in law dressed setting up the camera , time frame was later , we looked at the screen and saw myself and my gf walk in the lounge … we gulped but we were transfixed. Realizing it was last weeks time stamp . It showed me a d her arrive , leave the lounge , return with my gf in my sisters heels and underwear then we fucked on the couch , he had captured it all !

We were stunned as we watched . But immediately fucked again as we played on the screen.
Afterwards we put everything away and sat a little shell shocked as they came home . We left a d walked home wondering how long he had been filming us , how many tapes did he make , did my sister know.

Fyi , we kept on babysitting.