This lora needs to generate two characters. To make that, FallenIncursio made a great article : https://civitai.com/models/339604/how-to-generate-multiple-different-characters-mix-characters-andor-minimize-color-contamination-or-regional-prompt-adetailer-and-inpaint-or-my-workflow
Weight needs to be reduce : on my test weight between [0.4,0.5] looks working well especially 0.4. Best result got with landscape image 1216x832 but can work also with square image 1024x1024.
base prompt : fusion dance, fingers together, index finger raised, index finger together, index contact
You will need to install 'Regional prompt extension' and make a prompt like the following example, with 'BREAK' tag for separate the different character. I really suggest to read the article. It's very complete.
Prompt example : score_9, score_8_up, score_7_up, score_6_up, score_5_up, score_4_up, 2girls, highres, masterpiece, highly detailed face, highly detailed shining eyes, symmetrical highly detailed eyes, <lora:Fusion_Dance_DBZ-000019:0.4>, fusion dance, fingers together, index finger raised, index finger together, simple background, white background
BREAK <lora:Momo_Ayase_Dandadan_V1:0.8> KJOmomo, brown hair, dark eyes, medium hair, hair between eyes, thick eyebrows, earrings, white collared shirt, oversized pink pullover, long sleeves, red bow, blue short skirt, untucked shirt,
BREAK <lora:shiratori_aira_pony:0.8> , shiratori aira dandadan, short hair, pink hair, brown eyes, school uniform, red bow, skirt, sleeves past wrists