How to ask my (25F) Bf (25M) to use a strapon on me?

My (25F) Bf (25M) is an amazing guy but not a natural lover... we've been together since just out of school and had a steady relationship. However sex is just okay, it can be sensual but when I'm in the mood for something more aggressive he cant meet my needs...

He is doesn't have a huge tool, it doesn't seem to get very hard and when we make love we can't get past that sensual stage into a hard f&%$. which sometimes I really want/need. He usually climaxes within the first 20 seconds of going hard, Its flattering I turn him on so much, but I also feel I'm not getting satisfied. My first BF was better and always got me to orgasm, I obviously cant bring this up, Its shameful to admit but I have a fantasy of large getting f'ed by large C***s.

Over the last year I've been getting more into porn to cope with it, I find myself watching far more porn (I mostly look at GIFs more than anything) and most of it is centered around BBC, Squirt and gangbang. I think the desire for it has pushed me down a rabbit hole further.

Is there a way to my BF to wear a sleeve or strapon without hurting his feelings? could be 2 birds with 1 stone, increase stamina and feel a firmer sensation . Obviously i don't want to offend but at the same time I'm going crazy.

TL;DR Need satisfaction, think only way is if BF uses a dildo on me but dont want to mess up by asking.