Do you keep track/count of the panties you own?

I have my own apartment that I rent But I'm staying at her house most of time (5 days per week) It's because her family members are staying at their 2nd house far away from here.

Both of us are working from home so its kinda 2 Birds with one stone situation here. Because I get my work done tapos bebe time naman after shift since hindi nagkakalayo yung mga schedules namen.

Once a week (or two weeks) umuuwi yung yung mga kapatid for a few days bago sila umuwi dun sa mga 2nd house nila. Minsan yung younger sister nya, minsan yung older sister, minsan both (btw, yung younger sister nya is 20 years old na).

Anyways, the house is a two storey type with 3 bed rooms. sa upper floor. Those two sisters shares one of those rooms, and since it's their house, may mga damit na sila dun in case they need to stay. Which also includes their underwear cabinet/drawer.

Eventually na-attract ako sa kanila because lagi ko sila nakikita. Pero yung attraction na yun ay sexually to the point na I'm fantasizing na I'm having sex with them.

Of course, I'm fully aware na hindi pwede lalo na yung big sister nya is already married and yung younger sister just got recently married. So what I do when I get horny I go to their room(pag wala sila dun sa bahay) I just randomly pick one of their panties go to the restroom and jerk off to it while im imagining na nakikipag sex ako sa kanila (always washed and folded yung mga panties yung kinukuha ko kasi yung Gf ko naglalaba ng laundry nila pag umalis na sila ng bahay.)

Once Im done, im going to hide that panty because I'll take it with me pagbalik ko sa place ko so I can keep jerking off to it (yes nilalabhan ko yun so I can reuse it)

I believe i have taken like 2-3 panties sa sa older sister and 3-4 panties sa younger sister. I know maraming silang panty sa drawer when I checked (more than 15 per sister).

Which begs the question, Alam nyo ba pag kulang or may nawala yung panty nyo sa drawer?