Masturbate With Neighbours' Panties

I stay on the top floor of an apartment block. Each floor has 2 apartments. For some unknown reason, the toilet in my apartment has a small ventilation window which looks out onto the small balcony at the back of my neighbours' apartment. At this balcony, they have set up laundry lines.

As far as I can ascertain, 3 young working women (office ladies) stay in this apartment and I can view their lingerie on the laundry lines. Some of the lingerie are lacy, some bear cartoon motifs and some are ordinary cotton types.

I have on a few occasions, managed to fish some panties on the laundry line through the ventilation window in my toilet and then masturbate with them while fantasizing about the 3 women. I would cum onto the panties and then put them back on the laundry line to dry(the panties are hung on the laundry line via clothes hangers).

The women did not suspect anything and I think they wore those panties with my dried semen on them.