TLDR: Caught wife wanking with vibe; very uncharacteristic of her; how would you approach?

Throwaway account due to OPSEC.

I've been RP'd and followed the MRP forum since Summer 2016. I've followed RPChristians since inception. I've read the sidebar, and lift. This is me seeking advice from similar men on how they'd handle.

Our sex life has its ups and downs but has been satisfying lately. Overall we have a very strong, well-adjusted relationship. A problem in the past is she has not liked for me to get her off either manually or orally. Sometimes we'll do it together with the vibe. She has always said she gets way more out of PIV; and I have tried to approach this with the RP mindset of "her orgasm is her responsibility". Every session is not caveman though. I have offered to her help out in that department for years and have been turned down. I think I realize why.

I came home from work one day last week during lunch, which rarely happens. This was during my wife's short time when the 4 children are typically taking naps. She is a SAHM. I walked upstairs and heard a "buzzing" sound and I thought she must have been female-scaping: she does this from time to time. She heard me come in the room at the last second before I saw anything; however her face was flushed, etc. and I could smell it. She was definitely using our bullet vibe. Since then I've confirmed just by shifting the placement of the vibrator where it is stored and have seen that it is handled a couple times a week.

So this is the vibe that we use together, on occasion. I know what you may be thinking, and she's not having an affair. Logistically it is not possible right now for either of us. The more I think about it she's probably snuck away with the vibe while I'm gone for several years.

As a married Christian male, how do I approach this? My initial reaction was shock/surprise, some jealousy that I was not able to be involved, and some small amount of turn on as well.

I know that I've certainly committed more wrong than her in my life by looking at porn, wanking, etc, which is no longer a problem for me at this time.

For now I am thinking of leaving a note for her taped to the vibe, saying I'm happy that she's found a way to have a good time but would she please consider saving some of her mojo for us too. Perhaps that would start a conversation and allow her to gather her thoughts before being blindsided.

I don't want to outright condemn her or make her feel insecure; number one because of the log in my own eye but number two because handling it aggressively will probably work against us.