Is public a limit for you? If not then go out shopping, no underwear allowed, only a short skirt and as thin a top as you dare. Take with you something to insert into your vagina with you, it must be small enough to fit completely inside you, love eggs / Ben wa balls would be perfect. Also take with you 4 clothes pegs and a rubber band. Go into a shop toilets at the start of your trip, insert whatever you brought with you, hot sauce would make this task more difficult if you want. Now take the pegs, peg your inner lips closed to keep the item in. Flick each nipple 10 times as hard as you dare so they are erect and noticeable. Continue shopping, try and spend as long as possible out you can stand. When you come to remove the pegs, do not squeeze to release them, pull them off, after you remove each peg, flick each nipple a further 10 times. After you have removed the last peg also flick your clitoris 10 times also. If public really is a limit, do this task at home, naked, keeping the pegs on your pussy for at least 30mins. I'd love a report and pictures showing how you dressed, how erect your nipples get, and how swollen your pussy gets.
John