Place a thick marker or highlighter in your ass and dress normally, spend your time home alone with the marker inserted
Cover a plunger handle with a condom, rubber glove or any equivalent, see how far down te handle you can slide, perform this with lube while looking in the mirror
Spend a shower with one hand occupied, the number of soap/shampoo bottles in your shower is how many fingers you must keep inserted threw the duration if your shower
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