First start by taking pics of yourself with the word sorry written down your body. Next make up tack bra using the thread on kink talk to get ideas, you must not use more than 8 tacks a bra. Get a panty liner pad and cover it in toothpaste and position it along your pussy and then beg your boyfriend to give you a bra connection wedgie just before you are due to go out. Whilst out send him the pics and the tag 'I need to make this up to you'.
Never at any time tell him why you are sorry and let him use you in any fantasy he likes, you cannot say no.
Post a report back on here, the photos are optional.