He buys a dildo for practice

Midoriya decides the best way to learn would be to practice on a look a like. He thinks the plan over "The best practice would be the real thing but I'm not going to ask someone I know to help let alone a stranger. Not flexible enough to try it on myself, and its not like I'd be curled over in the wall anyways. The best option then would be a fake. I could buy a dildo to practice on while I look up techniques on my computer and just mirror them. All I'd have to do is buy the toy. But that has it's own problem, I want to practice tonight but if I ordered it online it wouldn't come until tomorrow. If I want one tonight I'd have to buy one in person. Just walk into a sex shop full of people, grab a lifelike dildo off the wall and buy it while everyone can see me. Sometimes I wish One-For-All had Toru's invisibility." He is red faced in embarrassment at what he's about to do.

He makes a stop his home to get out of his uniform and into the gangster disguise he used when they rescued Bakugo from the League of Evil. He searched the address of a nearby sex shop online and makes his way there. He enters the sex shop trying to keep a blank expression despite his actual embarrassment. To get this over with as soon as possible he heads right over to the wall of dildos and pauses. His eyes go wide as he sees the sheer variety of fake cocks.

'I didn't think there'd be this many to pick from.' He thinks as he looks them over. There are all sorts of sizes, colors, materials and features. His over analyzing mind gets to work picking out the best toy for his needs.

'Let's see, I know 6 inches is the average size but I should go a bit bigger so 7 inches. Color doesn't really change anything but a flesh colored one will help me get into the mindset. Obviously can't have one made of actual meat and a glass one won't feel real. Silicone rubber is the closest but I don't need one that's a fake shape. How would those other textures even feel though? Some are ribbed and some have bumps... no stick with anatomically correct. That should let me get a feel for the real thing. All that's left is features, let's see them. Vibrating might feel interesting but real ones can't so skip it. No need for the rabbit attachment and the inflatable options. Or the double ended ones for that matter. Ha! Maybe one day when this is all over me and Ochaco could share one someday... wait no! I wouldn't share a dildo I'd just use my actual-gah! Looking at all these dildos is putting cocks in my brain. Just keep going and look over the rest. Aha! A suction cup can help me stick it to my wall and keep it in place so that's useful. Oh and these ones can shoot fake cum, I guess I'd have to get used to that part too.'

With the parameters chosen he scans the wall and luckily finds a 7 inch, flesh colored, silicone rubber dildo with a suction cup and a built in cum tube. Actually holding the dildo in his hands makes a whole new wave of embarrassment wash over him. His face goes red and he walks quickly to the counter.

The store clerk is a fit young man with spiked black hair wearing a colorful shirt and a name tag that says Eiji. "Find what you're looking for? I've never seen someone stare at a wall of dildos that intensely before. You must have specific tastes."

Midoriya blushes and he drops the toy. His hands flail to grab the toy before it lands as he stammers out "N-no it's not for me! Um, it's for my girlfriend!"

Eiji chuckles and scans the item. "Alright well I'm sure your girlfriend enjoys it. Would you like some lube as well? We have a special lube that looks and tastes like cum, perfect for this kind of toy." He says with a wink. Midoriya nods, not really thinking and wanting it to be done. He pays for the item and it's put in a non-descript black plastic bag. With the purchase done he quickly grabs the bag and hurries out of the store. He hides it in his coat and runs all the way home. He shuts and locks his door, not wanting to be disturbed.